Explain the Concept of Absolute value

Post four problems that include absolute value
Two of them must be word problems. 
Solve three from another students post. 

Properties of Exponents
    
    Explore the following link 

    http://www.mathplanet.com/education/algebra-1/exponents-and-exponential-functions/properties-of-exponents


   
    Explain the following Properties of Exponents 
    Give examples of each with a problem
    Solve another persons problems.

Properties of Real Numbers
    Define provide example of the following.   
   
     Natural Numbers
    Whole Numbers
    Integers
    Rational Numbers
    Irrational Numbers
    
    Variable 
    Constant
    Term

#1.        25 - (-28) - [ 57 - ( - 86 - 19 ) ]


#2.         3x + 3 - 2x = -8